hemihydrate

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hemihydrate

[‚hem·ē′hī‚drate]
(organic chemistry)
A hydrate with a 2:1 molecular ratio of anhydrous compound to water, plaster of paris is the hemihydrate of calcium sulfate, composition CaSO4·½H2O.

hemihydrate

A hydrate which contains one-half molecule of water to one molecule of the compound; the most common such material is partially dehydrated gypsum (plaster of paris).
References in periodicals archive ?
Hemihydrate takes place hydration reaction immediately after mixing with water hence make the plaster high in solubility [10].
In chemical terms the codeine is 7,8-didehydro-4,5alpha-epoxy-3-methoxy-17- methylmorphinan-6-alpha-olphosphate (1:1) (salt) hemihydrates (Fig: 3) [11].
Due to the hemihydrate is an intermediate phase between the dihydrate and the anhydrous, which is metastable at all temperatures, in standard analyses of the Ca-S[O.